1,1
Cf. A000595, A000662, A001377.
Sequence in context: A053823 A034251 A170999 * A094486 A109741 A105759
Adjacent sequences: A051238 A051239 A051240 * A051242 A051243 A051244
nonn,bref
Vladeta Jovovic (vladeta(AT)eunet.rs)